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The interaction between strain and spin has received intensive attention inthe scientific community due to its abundant physical phenomena and hugetechnological impact. Until now, there is no experimental report on ultra-highfrequency magnetic resonance through the strain-spin coupling for anytechnologically relevant perpendicular magnetic material. Here we report theexperimental detection of the acoustic strain waves that have a response timeon the order of 10 picoseconds in perpendicular magnetic [Co/Pd]n multilayersvia a femtosecond laser pulse excitation. Through direct measurements ofacoustic strain waves, we observe an ultra-high frequency magnetic resonance upto 60 GHz in [Co/Pd]n multilayers. We further report a theoretical model of thestrain-spin interaction. Our model reveals that the energy could be transferredefficiently from the strain to the spins and well explains the existence of asteady resonance state through exciting the spin system. The physical originsof the resonance between strain waves and magnetic precession and the requestedconditions for obtaining magnetic resonance within thin magnetic films havealso been discussed after thorough analysis. These combined results point out apotential pathway to enable an extremely high frequency (EHF) magneticresonance through the strain-spin coupling.

Ultra-high frequency magnetic resonance through strain-spin coupling in perpendicular magnetic multi-layers